[KAPT4] KT-51982 Implement generation of @Metadata annotations in Java stubs

Also adds rendering of @Metadata annotations in Kapt3 and Kapt4 tests
(currently disabled for a few tests).

Co-authored-by: Alexander Udalov <alexander.udalov@jetbrains.com>

plugins/kapt3/kapt3-compiler/testData/converter/multifileClassDefaultPackage.txt

@@ -1,3 +1,12 @@
+/**
+ * public final class AnotherRootClass : kotlin/Any {
+ *
+ *   // signature: <init>()V
+ *   public constructor()
+ *
+ *   // module name: main
+ * }
+ */
 @kotlin.Metadata()
 public final class AnotherRootClass {
 
@@ -9,6 +18,15 @@ public final class AnotherRootClass {
 ////////////////////
 
 
+/**
+ * public final class RootClass : kotlin/Any {
+ *
+ *   // signature: <init>()V
+ *   public constructor()
+ *
+ *   // module name: main
+ * }
+ */
 @kotlin.Metadata()
 public final class RootClass {
 
@@ -21,6 +39,12 @@ public final class RootClass {
 
 package test;
 
+/**
+ * multi-file class {
+ *   // test/M1__BKt
+ *   // test/M1__CKt
+ * }
+ */
 @kotlin.Metadata()
 public final class M1 {